Analysis by: David John Agni
ALIASES:

Backdoor.PHP.Pbot.A (BitDefender), PHP/Pbot.A (ESET-NOD32)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

This backdoor may be downloaded by other malware/grayware/spyware from remote sites. It may be hosted on a website and run when a user accesses the said website.

It runs certain commands that it receives remotely from a malicious user. Doing this puts the affected computer and information found on the computer at greater risk.

  TECHNICAL DETAILS

File Size: 33,916 bytes
File Type: Other
Memory Resident: Yes
Initial Samples Received Date: 19 Nov 2015
Payload: Connects to URLs/IPs

Arrival Details

This backdoor may be downloaded by other malware/grayware/spyware from remote sites.

It may be hosted on a website and run when a user accesses the said website.

Backdoor Routine

This backdoor executes the following command(s) from a remote malicious user:

  • Login and Logout of the Bot
  • Terminate Bot
  • Restart the bot
  • Send an email
  • DNS lookup
  • Download a file
  • Execute a command
  • Get system information
  • Execute php code
  • TCP and UDP flood attack
  • IRC Command
  • Change Nickname
  • Port Scan
  • Change IRC server

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • arhy.{BLOCKED}ew.org:5151

It accesses a remote Internet Relay Chat (IRC) server where it receives the following commands from a remote malicious user:

  • irc.{BLOCKED}e.org:7000

  SOLUTION

Minimum Scan Engine: 9.800

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Scan your computer with your Trend Micro product to delete files detected as PHP_PBOT.CQ. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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